They say nothing brings people together like a common enemy.

Now dog owners on Sydney's affluent Balmain peninsula are coming together against his terrier 'Spike'.

Spike stands accused of being a biter, and Milne, a runner.

It all came out on social media when Spike bit a Rhodesian ridgeback called Winston last week.

His owner refused to give his name and walked away.

Winston's owner was so mad, she snapped a picture of him and posted it on a local parent's facebook page. It soon became clear Spike was a repeat offender.

"My parent's rescue greyhound was attacked by the same dog two weeks ago in Bridgewater Park!!" one user wrote.

"Same as me" another replied.

"They are well known in our area and have attacked our postie and neighbour's dog."

The rescue greyhound is Jack. He only has three legs and is very clearly timid when he returns to the park.

The mark on his one hind leg is still visible, even after two weeks and $900 in vet bills. "This scottish terrier just attacked Jack. Just started snapping and biting at him, and bit him on the back leg," said owner Peter Adam.

He was forced to intervene with no thought for his own safety.

One of the injuries allegedly inflicted by the Scottish terrier.

When Peter's wife Fran asked the owner for his details, he reportedly refused. "The attitude just was staggering. As if being in an off leash area was an excuse that your dog can go and attack other dogs."

As anger on the Facebook page grew locals identified Spike, and his owner as Milne.

When Ten News went to his house for comment, he wasn't home, and Spike just growled.

Inner West Council wouldn't confirm if any formal complaints had been made about Spike, but they did reassure ratepayers there was no preferential treatment for prominent executives.

"Please be assured that all Council investigations (including those carried out by companion animal officers) are done so fairly and equitably, regardless of who the alleged victim &/or owner is."

But now he's been identified, there is recourse for the dog owners to have their bills paid.

Turner Freeman Lawyer Gerard Morson told Ten "if a dog attacks another animal that isn't on their property or in the defence of someone else, then that owner is certainly liable."